• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Carbon fixation by biological soil crusts following revegetation of sand dunes in arid desert regions of China: a four-year field study.
【24h】

Carbon fixation by biological soil crusts following revegetation of sand dunes in arid desert regions of China: a four-year field study.

机译：干旱沙漠地区沙丘植被恢复后生物土壤结皮对碳的固定作用：一项为期四年的田间研究。

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Biological soil crusts (BSCs) are important sources of carbon input to ecosystems in arid and semiarid regions, where vascular plants are restricted by the rigorous environment and limited soil water. Sand dune stabilization by revegetation can enhance colonization and development of BSCs on sandy soil surfaces, and convert BSCs from the early successional stage dominated by cyanobacteria and algae to the later stage dominated by lichens and mosses. This study estimated the carbon fixation by two successional stages of BSCs based on four years of field observations. Carbon fixation by two BSCs has been compared via estimating daily carbon fixation using measuring net photosynthesis with ten sampling plots per crust stage in situ, combining with calculating the wet daytime of crustal cryptogam thallus. However, diurnal carbon fixation of both BSCs was largely determined by crustal water content rather than photosynthesis photon flux and temperature. The range of optimal gravimetric water content for early BSCs was 1-3.5%, and 1-5% for the later BSCs. The annual carbon fixation was 11.36 g C m-2 yr-1 for cyanobacteria-algae dominated crusts and 26.75 g C m-2 yr-1 for lichen-moss dominated crusts. The latter had a higher carbon input due to a higher water-holding capacity, prolonging wet daytime and higher chlorophyll content, as well as higher light capture. These findings indicate the recovery of BSCs is expected to significantly increase carbon input into sandy desert ecosystems.
机译：生物土壤结皮（BSC）是干旱和半干旱地区生态系统碳输入的重要来源，在这些地区，维管植物受到严酷环境和土壤水的限制。通过植被恢复来稳定沙丘可以增强BSC在沙质土壤表面的定殖和发育，并将BSC从蓝藻和藻类为主的演替初期转变为以地衣和苔藓为主的后期演替阶段。这项研究基于四年的现场观察，估计了BSC的两个连续阶段的碳固定。比较了两个BSC的固碳情况，方法是使用实​​测光合作用估算每天的固碳量，并在每个结壳阶段就地测量10个采样点，并计算地壳隐gam的湿日。然而，两种BSC的昼夜固碳很大程度上取决于地壳含水量，而不是光合作用的光子通量和温度。早期BSC的最佳重量水含量范围为1-3.5％，而后期BSC的最佳重量水含量为1-5％。对于蓝藻-藻类为主的壳，年固碳量为11.36 g C m -2 yr -1 ，对26.75 g C m -2 yr < sup> -1 用于苔藓为主的地壳。后者的碳输入量较高，这是因为其具有更高的持水能力，延长了白天的潮湿时间和更高的叶绿素含量以及更高的光捕获率。这些发现表明，BSC的恢复有望显着增加沙质沙漠生态系统的碳输入。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号